ABSTRACT
The study of interaction of many species arising in ecological systems has recently developed as a central problem in population ecology. In particular, problems of coexistence and exclusion of competing species have been theoretically investigated by using mathematical models. Especially, in order to understand spatial segregation of competing species, a variety of reaction-diffusion (RD) equation models have been proposed so far. Quite recently, it has been emphasized that the free boundary problem approach is very useful to know the dynamics of spatial segregation of competing species.
